Du Shi

Du Shi (died 38), also transliterated as Tu Shih, was the Governor of Nanyang under the Han from 31 to 38 CE. He is known for inventing the water-powed blowing-engine for agricultural improvements.

Biography
Du Shi was appointed governor of Nanyang about 31 CE under the Han dynasty, and according to the government-sponsored History of the Early Han Dynasty (composed around 200 CE), he was a generous man with peaceful policies, the destroyer of evil-doers, and the man who established the dignity of his office. He was said to be good at planning, and Du Shi loved the common people and wished to save their labor. While serving as governor, he invented a water-powered blowing-engine for the casting of iron agricultural improvements that allowed people to enjoy great benefit for little labor. His invention was widely adapted and used since then.